private async Task <bool> RemoveSubscriber(ChatId chatId)
        {
            var subscribedChats = _botContext.SubscribedChat.Where(s => s.ChatId == chatId.Identifier).ToList();

            if (subscribedChats.Count == 0)
            {
                return(false);
            }
            _botContext.RemoveRange(subscribedChats);
            await _botContext.SaveChangesAsync();

            return(true);
        }